// src/adapter/cloudflare-workers/websocket.ts
var upgradeWebSocket = (createEvents) => async (c, next) => {
  const CFWebSocketPair = globalThis.WebSocketPair;
  const events = await createEvents(c);
  const upgradeHeader = c.req.header("Upgrade");
  if (upgradeHeader !== "websocket") {
    return await next();
  }
  const webSocketPair = new CFWebSocketPair();
  const client = webSocketPair[0];
  const server = webSocketPair[1];
  const wsContext = {
    binaryType: "arraybuffer",
    close: (code, reason) => server.close(code, reason),
    get protocol() {
      return server.protocol;
    },
    raw: server,
    get readyState() {
      return server.readyState;
    },
    url: server.url ? new URL(server.url) : null,
    send: (source) => server.send(source)
  };
  if (events.onOpen) {
    server.addEventListener(
      "open",
      (evt) => events.onOpen && events.onOpen(evt, wsContext)
    );
  }
  if (events.onClose) {
    server.addEventListener(
      "close",
      (evt) => events.onClose && events.onClose(evt, wsContext)
    );
  }
  if (events.onMessage) {
    server.addEventListener(
      "message",
      (evt) => events.onMessage && events.onMessage(evt, wsContext)
    );
  }
  if (events.onError) {
    server.addEventListener(
      "error",
      (evt) => events.onError && events.onError(evt, wsContext)
    );
  }
  server.accept();
  return new Response(null, {
    status: 101,
    webSocket: client
  });
};
export {
  upgradeWebSocket
};